Source: wikibot/emirp
= Emirp
{wiki=Emirp}
An **emirp** is a term used in number theory to refer to a prime number that results in a different prime number when its decimal digits are reversed. The term "emirp" is derived from the word "prime" spelled backwards. For example, the number 13 is an emirp because it is prime, and when its digits are reversed, it becomes 31, which is also prime.